Figure 2-3. Front Panel Controls and Indicators (2 of 2)

TM 11-7025-234-23

Blinks when any test switch is pressed. This

TEST indicator

indicator is visible through the front panel.

(A4 board)

Lights when the carrier signal from the remote modem

CARR LOSS indicator

transmitter is lost.

(A4 board)

When the amplitude error rate is below a

MARG CKT indicator

(A4 Board)

predetermined threshold, the GOOD DATA indicator is

lit. For an error rate greater than the threshold,

the GOOD DATA indicator remains lit and MARG CKT

GOOD DATA indicator

also lights. A bit error rate less than the

(A4 Board)

threshold extinguishes the GOOD DATA indicator,

leaving only the MARG CKT lit.

Lights for a mark at the transmit logic data input,

XMT DATA Indicator

indicating transmit input data activity.

(A3 board)

RCV DATA Indicator

Lights for a mark at the receive logic data output,

indicating receive output data activity.

( A3 board)

FBK indicator

Lights whenever the RATE switch is not in position 1

(A3 board)

or CH fallback is enabled.

Lights when regulated voltage is present.

PWR indicator

(A3 board)

Figure 2-3.

Front Panel Controls and Indicators (2 of 2)

2-5